... well, foundation, oil & gas, cooling systems and drilling for heat exchange pumps. Applications were later found for ... role in all DTH drilling, regardless of application, rock type, hole depth or drill rig. The key features ... disturbance to the ground is kept minimum, and for drilling rock, the penetration rate is outstandingly high. • More ... The Hole) Drill Stem/Pipe Used On Drilling Rig in factory cost